Grinding machine



`une 8 1926.

F. SCHNEIDER GRINDING MACHINE 1921 2 Sheets-Sheet Filed Sept. l2.

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woe/wko@ 'nmvm. uv Schaub:

June 8 1926.

F. SCHNEIDER GRINDING MACHINE Filed sept. 12, 1921 2 Sheets-Sheet 2Patentes June s, 1926.

UNITED STATES PATENT oFFics.

FRANKLIN SCHNEIDER, OF CLEVELAND, OHIO, ASSIGNOR TO THE VAN lDOEN ELEC-TRIO rIOOL COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

GRINDING MACHINE.

Application led September 12, 1921. Serial No. 499,958.

My invention relates to improvements in grinding machines, and moreparticularly to a self-contained mechanism preferably comprising aninterposed electric motor and two opposing abrading discs driven by`said motor.

The object of my invention is the construction of a satisfactory andeiiicient grinding machine wherein the alignment is permanently insured,long bearings and supports are adorded for the grinding discs, and easyassemblage is secured. Further subsidiary objects will appear inconnection with the detailed description of my ,invention and itsembodiment.

The mechanism herein set forth as embodying my improvements may begenerally described as comprising an electric motor mountedintermediately of a relativ-'f :ly long driving shaft, which shaft issupported adjacent to its ends by widely displaced ballbearings, andterminally mounts the two grinding discs adapted to be driven by themotor and shaft. The ball-bearings are contained within two separatecylinders or quills; one of which is anchored to the frame oi themachine and the other is afforded a slight longitudinal movementtherein. The concentric hubs of the motor casing also are permitted aslight longitudinal movement with respect to the trarne, in common withthe driving shaft.

Further details of my improved construction and the advantages inherenttherein may he more readily understood by making reference to theacompanying drawings, wherein:

Figure l ot the grinding machine embodying my invention; the lower tramebeing broken away and the bearings being shown in vertical section.

Fig. 2 is a plan view of the leithand porg tion of: said grindingmachine showing the.

bearing-block removed,

Fig. 3 is a vertical section through the,

righthand end of said machine on line 3 3,

Fig. l, and Fig. 4 is a similar section illustrating the motor parts andconventionally 5G showing a complete frame.

Throughout the several figures of the drawings I have employed the samecharacter of reference to indicate similar parts.

The upper portion of the 'frame a is reis a view of the upper portionconcentric hubs b' turned thereon, throughV the shaft e, mounting themotor armature, extends beyond the ends of the frame, and

mounts the grinding discs f; Said hubs b are of the same diameter as theextremities of the quills c, so that the boxing may be set uptightlyagainst the hubs and retain the bearings and shaft in alignmentand the ends of the extended shaft against deflection or whipping. Byremoving the upper halves of the boxings the single shaft e extendingfrom abrading wheel to abrading wheel, together with all its surroundingsupporting and driving parts, including the relatively stationary androtating parts of the bearing structures and both the relatively andstationary motor parts may be lifted as a unit from the frame and may behandled as a unit. This arrangement enables the shaft and itsaccompanying parts to be readily assembled on the bench and the nalassembly in the frame to be simplified. Further, as

" will later appear, by providing properly aligned or co-aXial seats forthe bearing structures and the hubs of the stationary motor part, trueconcentricity or co-axial relationship of all of the operating parts ofthe mechanism is secured and maintained.

The outer ends ofthe quills house double hall-bearings c and the innerends are provided with single ball-bearings c', respectively, which arespaced at such distances asA to aii'ord a rigid rotatingsupport for eachrinding disc and its shaft section.

llt will be observed that the lefthand quill is rigidly pinned withinthe boxing by the stud or pin g w'jhich enters the hole g' boredtherefor in the enlarged cylindrical end portion c2. A stud or pin henters a slot in the lefthand extremity of the righthand quill c, and,similarly, a stud z' enters a slot in the lefthand hub o o the motorhousing. Accordingly, it is apparent that the alignment of the shaft andbearings will be preserved, since the slight longitudinal movement thusadorded bythe slot-engaging studs or pins, prevents any dedection of therelatively long shaft e.

Each grinding disc is freely accessible to its operative from threesides and the strains incident to its use are taken up by the widelyseparated bearings c', c, ol its individual quill, supplemented by thecorresponding bearings ot the opposing quill. Consequently, verypronounced rigidity and eciency 'are obtained in my improvedconstruction.

Having now described the preferred embodiment of my invention andcertain advantages inherent therein, ll claim as new aand desire tosecure by Letters Patent, the following:

l. ln combination, a single shaft providedwith means for supportingtools on its ends,

' separated bearing structures spaced along said shaft and eachincluding a relatively stationary part and a relatively rotating part,the latter secured to the shaft, said.

caring structures being each symmetrical about the axis of the shaft,`and a support therefor provided with spaced holding mem.- bers havingaxially aligned symmetrical portions to receive and hold said relativelystationary bearing parts, and driving Ameans lor said shaft. includingrelatively stationary and rotatable motor parts, the relativelyrotatable motor part bemg secured to the shaftbetween said two bearingstructures, and means for maintaining sald relatively l stationary motorpart concentrically related to the axis of said shalt and stationar withrespect to said rotating part, and inc uding means on .said relativelystationary motor part cooperatively lrelated to said holding members forholding said relatively stationary motor part against rotation.

2. llnl an abrading machine, the combination ot" a single shaftprovidedwith means tor supporting abrading tools on its ends, spacedbearing structures each co-axial with and exteriorly syetrical to theaxis of said shalt, drivin means for said shaft located between `/saibearing structures, a supporting frame havingcspaced supporting andholding members provided with aligned openings, said members and their oenings being arranged to receive and snugy hold vsaid bearingstructures, one of said members being arranged to hold its bearingstructure against longitudinal movement, and the other being arranged topermit longitudinal shifting therein of its bearing structure toaccommodate any tendency toward longitudinal shitting thereof.

3. lln an'abrading machine, the combination of a single shaft providedwith means for supporting abradingtools on its ends, spaced exteriorlysyetrical bearing structures upon said shalt, each including s acedbearings, a rotating motor part rigi y secured to said shaft betweensaid bearing structures, a stationary motor part surrounding the othermotor part upon the shaft, and a support provided with spaced holdingmembers having aligning parts conforming' to the external configurationof the bearing structures for supporting and holding the same, means forclamping one of said bearing structures in its holding member andthereby holding it against movement, means tor snugly holding the otherbearing structure in its holding member and permitting longitudinalmovement therein, and means for supporting the stationary motor partwith circumiterentially uniform clearance between it and the rotatinmotor part.

d. ln an abrading machine, the combination of a. single shaft providedwithv means for supporting abrading tools on its ends, spaced'exteriorly symmetrical bearing structures upon said shaft, eachcomprising an inner rotating bearing part secured to the shaft 'and anouter relatively stationary bearing part with spaced bearmgs betweensaid parts, a relatively rotating motor part secured to said shaftbetween said bearing structures, a relatively stationary motor partsurrounding said rotating motor part with the usual motor clearancetherebetween, a supporting part for said relatively station- `ary motorpart, and supporting means for all of Psaid parts, comprising a framehavingspaced supporting members provided with aligned openings andadapted to receive and snugly hold said bearing structures and thesupporting part for said relatively stationary motor part,I

5. lin a machine ot the class described, a tool supporting and drivingunit, compris- ,ing a single shaft having tool supporting,

means at lts extremities, two bearing structures spaced along saidshaft, each comprising rotatably connected relatively stationary' androtating bearing parts, the latter connected to the shaft and the formerbeingjexteriorly setrical therewith, and driving means tor said shaltincluding an elect-ric motor having a rotating motor part connected tosaid shaft between said structures and exteriorly symmetrical with theshaft axis and a relativel stationary motor part provided with a cavityin which the rotating motor part rotates and also having a supportingpart, said cavity and supporting part being symmetrical about the shaftaxis, whereby said stationary bearing parts and motor supporting partmay be secured to a support in co-axial relation to thereby securev andmaintain circumterentially uniform motor clearance.A

ln testimony whereof l do now ar my signature.

